Merge branch 'travis-root-checks-v2' of https://github.com/rudimeier/util-linux

Merge branch 'travis-root-checks-v2' of https://github.com/rudimeier/util-linux

* 'travis-root-checks-v2' of https://github.com/rudimeier/util-linux:
  travis-ci: enable root checks
  travis-ci: minor cleanup and speedup
  tests: introduce TS_CMD_UUIDGEN (never use installed one)
  tests, don't write TS_DEVICE to stdout anymore
  tests: ts_scsi_debug_init must not run in a subshell
  tests: cleanup ts_scsi_debug_init
  tests: some more tests need loop support
  tests: ts_device_init requires loop support
  tests: use ts_check_losetup in losetup test
  tests: add function ts_check_losetup
  tests: ts_device_init remove useless error handling